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Finding the Third Proportional to 138,435.50 and 216,880.50

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Solution

The third proportional to 138,435.50 and 216,880.50 is: 339,776.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,435.50 : 216,880.50 = 216,880.50 : x
  2. Step 2: Convert to fraction form
    138,435.50/216,880.50 = 216,880.50/x
  3. Step 3: Cross multiply
    138,435.50x = 216,880.50 × 216,880.50
  4. Step 4: Simplify right side
    138,435.50x = 47,037,151,280.25
  5. Step 5: Solve for x
    x = 47,037,151,280.25/138,435.50
  6. Step 6: Final answer
    x = 339,776.66

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.